Coding & Algorithms Interview Questions
Practice 3,469 real Coding & Algorithms interview questions for 2026. Covers companies like Meta, Amazon, Google, Uber, and Microsoft. Real questions from actual interviews with detailed solutions — ideal for focused interview preparation. Coding & Algorithms interview questions are the single most common technical gate for software engineering roles and are used to evaluate problem framing, algorithm selection, complexity trade-offs, correctness, edge-case reasoning, and clear communication under time pressure. Expect this category to appear in early technical screens and repeatedly across onsite loops at companies that weight it heavily (notably Meta, Google, and Amazon). Interviews will test arrays and strings, trees and graphs, dynamic programming, hashing and two‑pointer techniques, and the candidate’s ability to test and optimize code in a shared editor. Prepare with timed mock interviews, practice in the same editor you’ll use live, and build a progressive schedule that moves from fundamentals to medium/hard problems; typical candidates invest several weeks to a few months of focused practice depending on seniority and target company.
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Find Maximum Sum of Contiguous Subarray Length k
Scenario Monitoring website traffic and needing the highest traffic within any fixed-length time window. Question Given an array of positive integers ...
Determine Circle Intersection Status for Rendering Order
Scenario Graphics engine must evaluate multiple pairs of circles to decide rendering order based on intersection. Question Given an array where each e...
Determine Most Frequent Product Color in Carts
Scenario Online store wants to know which color of product appears most frequently in customers’ carts. Question Implement a function getMaxColor(colo...
Implement Function to Return First n Prime Numbers
Scenario Quick algorithm screen to gauge Python fluency. Question Implement a Python function that returns the first n prime numbers. Hints An optimiz...
Identify Longest Consecutive Incrementing Watch-Time Sequence
Scenario A streaming platform records daily minutes watched per user and wants to identify engagement streaks. Question Given an unsorted integer arra...
Maximize Stock Trading Profits Using Dynamic Programming
Scenario Evaluating dynamic-programming skills on stock-trading profits. Question Given an array of daily stock prices and an integer K, write Python ...
Solve Data Structure Challenges with Python Algorithms
Scenario You are given coding challenges in Python to manipulate simple data structures. Question Remove duplicates from a list of integers while pres...
Remove Duplicates While Preserving Order in List
Scenario A data pipeline receives an unordered list of IDs containing duplicates; downstream components require a duplicate-free list while preserving...
Implement Function to Determine Mode and Prime Numbers
Scenario Implementing utility algorithms within a data-processing library. Question Write a function that returns the mode of an integer list; if all ...
Explain Python Virtual Environment Setup and Function Analysis
Scenario Technical screen where candidate and interviewer jointly walk through Python code snippets used in a data-science repository. Question Show h...
Compute Averages of Unique Numbers in Dictionary Lists
Scenario Python tech screen: given a dictionary mapping keys to numeric lists, e.g., {'a':[1,2,1],'b':[1,2,3]}, compute the average of each list after...
Solve Aptitude Test: Logical, Numerical, Verbal Reasoning
Scenario Pre-employment aptitude screen assessing logical, numerical and verbal reasoning within a strict time limit Question You have 15 minutes to s...
Implement Real-Time Rate Limiting for Web Service Requests
Scenario A web service must throttle traffic from clients; you need to decide in real-time whether each incoming request should be served or rejected ...
Optimize Job Routing in Parallel Machine Scheduling
Scenario In the Production Factory game, jobs with varying processing times arrive and must be routed through two parallel machines to minimize total ...
Calculate 7-Day Rolling Average for Energy Consumption
Scenario Hiring manager wants a quick coding exercise to verify programming fluency. Question Write a Python function that takes a list of daily energ...
Implement Python Function for Statistical Test P-Values
Scenario You need a utility that calculates p-values for one-sided and two-sided statistical tests. Question Write a Python function compute_p_value(s...
Find Shortest Clear Grid Path
Given an n x n binary grid, where 0 means open and 1 means blocked, return the length of the shortest clear path from the top-left cell to the bottom-...
Find the Slowest Function from Profiler Events
You are given a time-ordered profiler event log for a single-threaded program. Each event is one of: - START functionName timestamp: execution enters ...
Design a Fixed-Capacity Least-Recently-Used Cache
Design a Fixed-Capacity Least-Recently-Used Cache Design and implement a cache with a fixed maximum capacity that evicts the least recently used entry...
Greedy Longest-Match Tokenizer for an LLM Data Pipeline
You are building a text pre-processing step for a large-language-model training pipeline. Before raw text can be fed into the model, it must be split ...